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Dual Capstan Tape Transport

IP.com Disclosure Number: IPCOM000075970D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Orlando, A: AUTHOR [+3]

Abstract

This transport provides constant-tape speed and constant-tape tension through the interaction of two capstans, without the use of any auxiliary drag devices.

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Dual Capstan Tape Transport

This transport provides constant-tape speed and constant-tape tension through the interaction of two capstans, without the use of any auxiliary drag devices.

During forward tape motion the motor 10 drives the left shaft 12 clockwise at S2. Both pulleys 14 and 16 and the capstan 18 on this shaft 12 then rotate at S2. The overrunning clutch pulley 16 drives the pulley 20 on the right shaft 22 clockwise at S1 because of the pulley ratio. Therefore, all members fixed to the right shaft rotate at S1. The net result is that the right capstan 24 rotates faster than the left capstan 18. This constant-speed difference results in tape 26 moving at a constant speed under constant tension. As can be seen, the differential speed at the right rear clutch pulley 30 allows overrunning.

The motor is reversed for backward motion and all parts on the left shaft 12 turn counterclockwise at S2. The rear pulley 30 on the right shaft 22 turns counterclockwise at S3. Now through the tape 26 the right capstan 24 is pulled by the left capstan 18. It cannot be pulled any faster than S3 since the rear overrunning clutch limits or holds back the right shaft 22 to S3. The speed conditions at the left shaft clutch pulley 16 are such that it overruns. Tape 26 moves backward at a constant speed and under constant tension due to the capstan speed differences.

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